These are the options available for you to choose from the list of Kernel Configurable options as soon as you enter make config at the prompt as described in the previous section.As
soon as you enter make config at the prompt as described in the previous step, a list of Kernel configurable options will be displayed for you to choose to configure the Kernel, you must indicate what
features and devices drivers you want to include in your Linux system and select how to include support for specific devices. Typically, for each configuration option, you have to respond with one of the following
choices: We have used a simple convention for our example configuration:

Example 7-1. SMP support

Symmetric multi-processing support (CONFIG_SMP)Y/M/NN

where

Symmetric multi-processing support (CONFIG_SMP) -is one of the choice

We have choosen to say N in this case.

Y/M/N - are the options you have i.e. you can say yes or no or choose as module.

[Y] -To compile into the kernel and always be loaded

[M] -To use a module for that feature and load that segment of code on demand

[N] -To skip and excludes the support for that specific device from the Kernel

:
It is important to note that majuscule letter of n or y mean the default choice. If a device does not have a modular device driver, you will not see the [M] option. Some
time an [?] option will appear in the choices. This mean that you can get more information about the feature when you type ? + ENTER key. Choosing the [?]
help option will opens another terminal describing the option.